Equalizer circuit for a repeater

Details Equalizer circuit for a repeater Equalizer circuit for a repeater

1981-11-12

1984-01-03

Gensler, Paul L.

Wave transmission lines and networks

Coupling networks

Equalizers

330304, 333214, H03H 703

Patent

active

044244991

ABSTRACT:
An electronic hybrid voice frequency repeater having a pair of term sets interconnected by a four-wire circuit for separating the two directions of signal transmission and amplifying each direction separately. Each term set couples the repeater's four-wire circuit to a two-wire line and has a differential current driver for driving the two-wire line and a differential amplifier connected in a feedback loop for sensing the differential signal voltage across the two-wire line, to drive the current driver and to feed an incoming differential signal on the two-wire line to the repeater's four-wire circuit while nulling signals arriving at the term set from the four-wire circuit to prevent them from returning to the four-wire circuit. Other features disclosed include a low frequency clamping circuit, an adjustable-gain amplifier, and an equalizer for non-loaded cable.

REFERENCES:
patent: 1938256 (1933-12-01), Jacobs
patent: 2737629 (1956-03-01), Beerbaum et al.
patent: 3715680 (1973-02-01), Fleischer
patent: 4016483 (1977-04-01), Rudin
patent: 4118700 (1978-10-01), Lenihan

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